I worked in a car spares shop which made up car number plates. We had a display on the wall showing the type of plates we could make up while the customer waited. On one occasion, a guy came in who wanted a front plate for his van.
I went out to the back of the shop to start making it up, when I noticed that the registration had the letter O included in it. Unfortunately, I had run out of O,s, so I tried cutting up a Q which didn't work.